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Yuki Hatoba She was the first victim to have her heart's egg hatched into a X-Character. 
 Her egg was "hardened" due to her worring about moving to America 
 and having to face changes at which point Nikadou transformed it into a X-Egg.
 
In the end, she was able to face the changes and moves to America. 
 
 Yuki's Guardian Character is dressed in a teacher's outfit. She is also very good in English.

 
 Source:

shugochara.wikia.com